Unanswered Questions
391 questions with no upvoted or accepted answers
6
votes
0
answers
745
views
nRF24L01 continuously reading closed pipe
I am testing communication between two nRF24L01 modules. The receiver is getting the transmitted message but is also continuously reading (null) data from a closed pipe? I am using the RF24 by TMRh20 ...
- 121
5
votes
0
answers
361
views
SPI between Master arduino and Slave arduino
How can I send the string from Slave SPI to Master SPI?
I want to write code in Bare Metal.
The problem which I am facing is I can't make out what will be my blocking function in Master SPI code when ...
CommunityBot
- 1
5
votes
0
answers
1k
views
Manchester 433MHz Nano to ATTiny85
My transmitter is a Nano, the receiver is a Tiny85.
I use a Logic Analyzer to check if stuff is moving, I can clearly see data coming in at the receiver.
The receiver does not 'decode' the data, man....
- 2,522
4
votes
0
answers
76
views
Can I use regular pins (Example: D2, A3, etc...) as serial (RX, TX)?
Python/Arduino Beginner here...
I have a DFplayer I am trying to hook to my Arduino and I want to hook it up through the regular pins instead of the RX and TX pins, but I've not been able to find ...
- 41
3
votes
0
answers
381
views
Raspberry pi pico (Arduino core) not initialising SPI correctly for NRF24l01
I'm working on a project where i have a Raspberry pi Pico connected to a NRF24l01+ to send some data.
However i'm not recieving any data on the reciever and i think that its because the SPI bus is not ...
- 1,525
3
votes
0
answers
1k
views
ESP32-C3 SPI Class documentation/features?
ESP32-C3 has a nice feature called GPIO Matrix which allows to map most of it's peripherals to any GPIO pin. And it has feature called IO_MUX which allows direct & faster operations for some of ...
- 131
3
votes
0
answers
204
views
Black screen when using higher SPI-speed for RA8857 LCD-controller
I'm using an Arduino Due that talks via SPI to an LCD (800x480) with the RA8875 controller chip.
The most recent datasheet I could find is: RA8875 datasheet.
Everything works as expected when using ...
- 155
3
votes
0
answers
121
views
Keypad - Speaker - Interference
I am trying to build a system, that plays specific audios (.wav files) from a SD-Card, according to the key combination that has been pressed.
I am using:
4x4 Membrane
4 Ohm Speaker
MicroSD Card ...
- 1,795
3
votes
0
answers
551
views
nRF24L01+ problem with receiving response
I'm sending currently data from a Raspberry to an Arduino, but I have a problem with receiving response from the Arduino back to the Raspberry:
Sent the message: ['H', 'i', '.', '.', 'A', 'r', 'd', '...
- 31
3
votes
0
answers
793
views
SPI register read returns 0x00 or 0xff
I am trying to interface a Arduino Uno with an ASM330LHH using SPI. Whenever I try to read any register, I either get 0xff or 0x00 on the serial monitor
The code I am using:
#include <SPI.h>
#...
3
votes
0
answers
2k
views
Arduino Bluetooth upload problem HC-05 v4.0
I upload code into arduino nano using a self-made PCB with bluetooth using this method. I was initially using Arduino Nano (chinese Clone, the one with CH340G) and Bluetooth module HC-05 (version 3.0) ...
3
votes
0
answers
2k
views
How to use SPI to set/ read registers for a sensor (Avoiding need for Github Lib)
Ok so as some readers might have seen, my current project involves using MPU's. The idea is sending data via CAN bus to a controlling MCU to then send to a raspberry pi to perform the calculations ...
- 99
3
votes
0
answers
220
views
Scheduling and BLE Read on demand
I'm building a data logging device with BLE capability using RFduino.
Sensors are read using timer interrupt to a buffer. When the buffer is full, then the whole buffer is written to SD card.
At the ...
- 2,522
3
votes
0
answers
498
views
SPI communication between two Ethernet Shields (W5100)
I am a newbie to the world of IoT, I want to ask...
Is it possible to connect two Ethernet shields with SPI? And if yes, how can I codes them?
I have reference from http://www.gammon.com.au/spi and ...
- 31
3
votes
0
answers
653
views
Arduino nano clone problem with interrupt on falling edge on pin 2
I've s 1Hz square wave coming from a DS1307 SQW/OUT pin going into pin2 on the Nano that is set up as input with internal pullup enabled.
I've set up the interrupt on falling edge but I can't get the ...
- 2,522